export default {
    bind:function (el,binging,vnode, oldVnode) {
        const dialogHeaderEl = el.querySelector('.el-dialog__header')
        const dragDom = el.querySelector('.el-dialog')
        dialogHeaderEl.style.cursor = 'move'
        // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
        const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null)

        dialogHeaderEl.onmousedown = (e) => {
            console.log(e)
            // 鼠标按下，计算当前元素距离可视区的距离
            const disX = e.clientX - dialogHeaderEl.offsetLeft
            const disY = e.clientY - dialogHeaderEl.offsetTop
            // 获取到的值带px 正则匹配替换
            let styL, styT
            if (sty.left.includes('%')) {
                styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100)
                styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100)
            } else {
                styL = +sty.left.replace(/px/g, '')
                styT = +sty.top.replace(/px/g, '')
            }

            document.onmousemove = function (event) {
                const l = event.clientX - disX
                const t = event.clientY - disY

                dragDom.style.left = `${l + styL}px`
                dragDom.style.top = `${t + styT}px`
            }

            document.onmouseup = function (event) {
                document.onmousemove = null
                document.onmouseup = null
            }
        }

    }
}